Enhancement of the second harmonic response by adsorbates on gold colloids: The effect of aggregation

被引：186

作者：

Galletto, P

Brevet, PF

Girault, HH

Antoine, R

Broyer, M

机构：

[1] Univ Lyon 1, Spectrometrie Ion & Mol Lab, CNRS, UMR 5579, F-69622 Villeurbanne, France

[2] Ecole Polytech Fed Lausanne, Lab Electrochim, CH-1015 Lausanne, Switzerland

来源：

JOURNAL OF PHYSICAL CHEMISTRY B | 1999年 / 103卷 / 41期

关键词：

D O I：

10.1021/jp991937t

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 [物理化学]; 081704 [应用化学];

摘要：

The extinction profiles as well as the hyper Rayleigh scattering signal of a highly monodisperse 22 nm diameter gold colloidal sol in the presence of pyridine have been measured. A strong enhancement of the HRS signal is observed in the presence of small amounts of pyridine. The relationship between the extinction spectra, the distribution of aggregated particles, and the second harmonic response has been investigated by evaluating the enhancement factor of the electromagnetic field in the colloids as they slowly aggregate. It is also shown that at larger pyridine concentrations, the hyper Rayleigh scattering signal levels off owing to the formation of large aggregates.

引用

收藏

页码：8706 / 8710

页数：5

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